时间:2019-01-22 作者:英语课 分类:自然百科2011年


英语课

 Earth's magnetic field has reversed thousands of times since its formation 4.5 billion years ago. And scientists now believe that the next reversal is imminent 1. The race is on to predicting exactly when it will occur. In 2010, the European Space Agency will launch SWARM 2. Its mission is to generate accurate, up-to-the-minute maps of the Earth's magnetosphere and anticipate its future activity. Professor Nils Olsen of the Danish National Space Center is working on the mission. 


 
 
 
“Then you’ve had exciting idea behind SWARM is that we have three satellites. We have higher satellite at an altitude of 530 kilometers and we have a pair of satellites at an altitude of about 400 kilometers.”
 
 
 
These identical satellites are equipped with new generation magnetometers. These will detect minute variations and field strength as well as identifying any new areas where the poles are reversing. 
 
 
 
“I think it's amazing that we can take magnetic measurements by the satellites flying at a few hundred kilometers, and say something about the deepness into the earth how the molten iron moves at a depth of about 3,000 kilometers. Is that amazing?” 
 
 
 
Scientists hope these satellites will help them predict when the magnetic poles are about to switch. They might even save lives. 
 
 
 
“I think that in the next decade or two, we can develop a science to forecast where the Earth's magnetic field is headed, and use that then as a planning tool; use that as a planning tool for people who fly satellites; as a planning tool for people who fly manned spaceflight and develop the technologies necessary to deal with, but say, an impending 3 reversal.”
 

adj.即将发生的,临近的,逼近的
  • The black clounds show that a storm is imminent.乌云预示暴风雨即将来临。
  • The country is in imminent danger.国难当头。
n.(昆虫)等一大群;vi.成群飞舞;蜂拥而入
  • There is a swarm of bees in the tree.这树上有一窝蜜蜂。
  • A swarm of ants are moving busily.一群蚂蚁正在忙碌地搬家。
a.imminent, about to come or happen
  • Against a background of impending famine, heavy fighting took place. 即将发生饥荒之时,严重的战乱爆发了。
  • The king convoke parliament to cope with the impending danger. 国王召开国会以应付迫近眉睫的危险。
学英语单词
adsorption chromatography
Aguas Zarcas
Aimargues
air feeder
Alleppey
Almen extreme pressure lubricant testing machine
annuniciator
ASCB
barley sugar
beddy-bye(s)
Bethnal Green
blueing process
body-snatcher
broad-brim
Bulbophyllum reptans
carcelle
celery leaf spot
certificate of bank balances
charge position
Computing Surface
curriculums
Dali City
dress-coated
eight-year study
Eun.
extramaster
follow ... inclinations
free-electron laser
fringe setae
frontierlands
gauze kerchief
girals
graverobbers
griddlecakes
higher-ranked
index of scanning helix
keel clearance
Korean Strait
Lented
LF reject
lienomycin
llano
low potential metal
lumped parameter circulator
macroamylasemic
melting speed ratio
mode of deformation
mother-of-thousands
Mount's Bay
non riparian
nonrefugee
north-easterners
Old Pretender
oligodotia
Oloiserri
organouranium compound
passive incontinence
ping-pong buffer
plain module board
planimetric line
plate cylinder
poker coordinates
prefacive
pulpitis
rairoad engineering
range span
record-collector
Rhododendron hukwangense
salween r.
segled card
Selma chalk
shock position
sounding device
stauntonin
stores fund
supernutrition
surirella voigtii
surplus
Suzuka-tōge
swr indicator
syndrome of stagnated gallbladder qi with disturbing phlegm
Sāngla
tetrahedral angle
thermoperiodicity
transverse occipital sulcus
trond
tub-fast
tummy crunch
Turbellaria
two-pence piece
ultra-high-speed lift
unhele
unobservable quantity
unsety
variable quadri-correlator
vicchio
wavefront advance
wet-bulbs
Wohlhynian fever
wtnh
Xuan Duong
zonary placentation